`38,` How about going swimming together this afternoon?

`-` Let + V0! : Hãy làm gì đó - đưa ra đề xuất.

`=` How about `+` V-ing: Còn việc đó thì sao..? - đưa ra đề xuất.

`39,` It is good for our health to work out regularly.

`-` It is + adj + to V0

`40,` It's important to have a balanced diet.

`-` It is + adj + to V0

`41,` She has not written to me for 2 years.

`-` The last time `+` S `+` V-ed/V2 `+` was `+` khoảng thời gian `+` ago.

`=` S `+` have/has `+` not `+`  V-ed/V3 `+` for `+` khoảng thời gian. 

38. How about going swimming together this afternoon?

- Let's + V(bare): Hãy làm việc gì đó

=> How about + V-ing?: Làm việc gì đó thì sao?

39. It is good for our health to work out regularly.

- V-ing + O + tobe + adj (+ for sb)

=> It is + adj (+ for sb) + to V

40. It's important to have a balanced diet.

- V-ing + O + tobe + adj 

=> It is + adj + to V

41. She has not written to me for 2 years.

- The last time + S + V2/ed + was + khoảng thời gian + ago: Lần cuối cùng ai đó làm gì là khi nào

=> S + have/has + not + V3/ed + for + khoảng thời gian: Ai đó đã không làm gì trong bao lâu